Submitted by The_Godlike_Zeus t3_11ow9xf in askscience
Say you got some chronic infections, like a parasite/bacteria/virus. It becomes active, then goes dormant again, and repeats. Maybe you don't notice symptoms but the immune system is battling it when it acts up, which likely causes colllateral damage. Let's say you now boost your immune system by healthy habits like exercising, cold showers, healthy food and whatnot. Is it possible for the immune system to fully eradicate a chronic infection because it is now 'capable' somehow of doing things that it previously couldn't? Maybe it detects the dormant guys when before it couldn't? Kinda like how a person with AIDS will catch infections easily, but in reverse.
EDIT: So I feel like many people are misinterpreting a 'boosted' or 'stronger' immune system as one that recklessly attacks everything. That's not what I meant. Stronger refers to 'an increased ability to detect what is and what is not part of the body'. Chronic infections are allowed to exist because the body doesn't recognize that the infection is not supposed to be there. Making the system stronger is meant as saying, making the system being able to recognize these pathogens better, so they can be removed.